different between breastwork vs earthwork

English

breast +? work

breastwork (plural breastworks)

A fortification consisting of a breast-high bulwark; a parapet.
(nautical) A railing on the quarter-deck and forecastle.
- 1878, J. W. King, Report of Chief Engineer J. W. King, United States Navy On European Ships of War and Their Armament, Naval Administration and Economy, Marine Constructions and Appliances, Dockyards, etc., etc., Washington, p. 287, [2]
  The Independencia is a two-turreted, breastwork ship of 9,000 tons displacement. […] The central breastwork is 130 feet in length at the top of the belt, and extends to the upper deck, 11 feet above the water-line. This breastwork incloses the boiler and engine hatches, the scuttles to magazines and shell-rooms, the principal openings for ventilation, and the two turrets.
A parapet.
- 1922, James Joyce, Ulysses Episode 2
  A swarthy boy opened a book and propped it nimbly under the breastwork of his satchel. He recited jerks of verse with odd glances at the text:
(slang) Breast augmentation.

earth +? work

earthwork (plural earthworks)

Any structure made from earth; especially an embankment or rampart used as a fortification.

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